print('this is a variable')
# 变量  variable
a_v1= 12
print(a_v1)
jack_1_t='hello neo'
print(jack_1_t)

PI = 3.1415    #常量
print(PI)

CV = 1
Bv_1 = 12.31
a = Bv_1//CV    #整除
A = Bv_1/CV     #浮点除
print(a,A)